When performing CPR on an adult, what is the first step?

Answer: C — Checking responsiveness

When performing CPR on an adult, the first step is to check responsiveness. This is crucial because it allows the responder to assess whether the victim is conscious or unconscious. Checking responsiveness involves gently shaking the person and shouting to see if they respond. If the individual does not respond, this indicates that they may need immediate medical assistance. Once responsiveness is evaluated, the next steps can effectively unfold. If the person is unresponsive, it prompts the responder to call for help or activate emergency services, ensuring that professional medical assistance is on the way. It is also essential to determine if the person is breathing normally. Only after confirming these elements should the responder proceed to administer rescue breaths or perform chest compressions, depending on the situation. In this context, options involving rescue breaths or immediate compressions are not appropriate as first actions, since they fail to establish the victim's condition. Calling for assistance is a crucial part of the subsequent response, but without first checking responsiveness, it may lead to delays in crucial immediate care.